1) Determination of rare-earth elements in coal using microwave digestion and gradient ion chromatography
Ronald T. Watkins, Moira K. Ridley, M.A.Bruno Pougnet, James P. Willis
Chemical Geology
Volume 121, Issues 1–4, 5 April 1995, Pages 273–283
- DOI:
http://dx.doi.org/10.1016/0009-2541(94)00119-S
Rumyana Djingova, Heike Heidenreich, Petya Kovacheva, Bernd Markert
Analytica Chimica Acta
Volume 489, Issue 2, 18 August 2003, Pages 245–251
- DOI:
http://dx.doi.org/10.1016/S0003-2670(03)00716-5